1 Peter 1:24,25 - Joseph Benson’s Commentary on the Old and New Testaments

For all flesh Every human creature, is transient and withering as grass The word χορτος, here rendered grass, denotes not only what we generally call grass, but all kinds of herbs; and among the rest, those which have stalks and flowers. And all the glory of man His learning, wisdom, wealth, power, dignity, authority, dominion; as the flower of grass Which is yet more frail than the grass itself. The grass withereth of itself, if not cut down by the scythe of the mower; and the body of man gradually wastes away and perishes, even if it be not cut off by some unexpected stroke; and the flower thereof falleth away Drops its blooming honours, and falls dying to the ground; and thus precarious and uncertain are all the dependances which we can place on perishing creatures. But the word of the Lord His revealed truth, by which you are regenerated or begotten again to a lively hope of a heavenly inheritance; endureth for ever Always remains true and infallible, a foundation on which we may safely build our present confidence and future hopes. The reader will recollect that this is a quotation from Isaiah 40:6-8; “where the preaching of the gospel is foretold and recommended, from the consideration that every thing which is merely human, and among the rest the noblest races of mankind, with all their glory and grandeur, their honour, riches, beauty, strength, and eloquence; as also the arts which men have invented, and the works they have executed, all decay as the flowers of the field. But the incorruptible seed, the gospel, called by the prophet the word of the Lord, shall be preached while the world standeth; and the divine nature, which it is the instrument of conveying to believers, will remain in them to all eternity. James likewise hath illustrated the brevity and uncertainty of human life, with its glory, by the same figures, James 1:11.”